The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Primary Chain PD1
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="oexing" data-source="post: 102546" data-attributes="member: 1493"><p>You could buy any brand of triplex chains, these are basically extremely strong for that primary drive purpose. Many bikes have a lot weaker chains, duplex or single chains. After all, a 1000 cc V-Twin is only two 500 cc singles flying in a close formation when chain stress is calculated. BUT: You have to ditch that miserable ESA or block it because it is the root of the problem of breaking chains: NO ESA is a lot easier on the chain than having to cope with all that slamming of ESA components when they hammer onto full compression as the springs cannnot possibly prevent that due to the completely wrong design of the ESA cams - way too flat and no progressive action to fight the full lock. That bang-bang behavior has been watched by other Vincenteers like Hamilton. Even when you find a chain that does not break you still have the stress by shock waves from ESA into chain and onto the main bearings and more so onto the gearbox input ball bearing. No way I´d accept that knowing how to prevent it - by fabricating my own ESA cams with progressive character, see my picture below. We had this discussed some time ago but frustratingly the club gods did not even want to look at this in ignorance (or pride?) for including in a future production, which would be a bit cheaper as the positive lobes are a simple 6mm radius that any cnc mill does in minutes. The corresponding negative shape requires a cnc mill with cnc dividing head for two axes milling. I could do it on my manual mill and DRO plus rotary encoder on the dividing head at first try so any bright cnc guy should be able to copy when I could do that with my 65 year old brain. </p><p> Anyway, I´d suggest blocking the ESA with a big o-ring replacing the springs to prevent full compression and its shocks. What is missing in my photo is a steel cup covering the spring holes and keeping the o-ring from expanding by cenrtifugal forces. It is worth a try, the o-ring is easily replaced by bigger size or rubber plate or some such when trials say so. Even welding up the ESA would be better than the original misery. </p><p></p><p> Vic</p><p>[ATTACH=full]25281[/ATTACH]</p><p></p><p>[ATTACH=full]25282[/ATTACH]</p><p></p><p>[ATTACH=full]25283[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 102546, member: 1493"] You could buy any brand of triplex chains, these are basically extremely strong for that primary drive purpose. Many bikes have a lot weaker chains, duplex or single chains. After all, a 1000 cc V-Twin is only two 500 cc singles flying in a close formation when chain stress is calculated. BUT: You have to ditch that miserable ESA or block it because it is the root of the problem of breaking chains: NO ESA is a lot easier on the chain than having to cope with all that slamming of ESA components when they hammer onto full compression as the springs cannnot possibly prevent that due to the completely wrong design of the ESA cams - way too flat and no progressive action to fight the full lock. That bang-bang behavior has been watched by other Vincenteers like Hamilton. Even when you find a chain that does not break you still have the stress by shock waves from ESA into chain and onto the main bearings and more so onto the gearbox input ball bearing. No way I´d accept that knowing how to prevent it - by fabricating my own ESA cams with progressive character, see my picture below. We had this discussed some time ago but frustratingly the club gods did not even want to look at this in ignorance (or pride?) for including in a future production, which would be a bit cheaper as the positive lobes are a simple 6mm radius that any cnc mill does in minutes. The corresponding negative shape requires a cnc mill with cnc dividing head for two axes milling. I could do it on my manual mill and DRO plus rotary encoder on the dividing head at first try so any bright cnc guy should be able to copy when I could do that with my 65 year old brain. Anyway, I´d suggest blocking the ESA with a big o-ring replacing the springs to prevent full compression and its shocks. What is missing in my photo is a steel cup covering the spring holes and keeping the o-ring from expanding by cenrtifugal forces. It is worth a try, the o-ring is easily replaced by bigger size or rubber plate or some such when trials say so. Even welding up the ESA would be better than the original misery. Vic [ATTACH=full]25281[/ATTACH] [ATTACH=full]25282[/ATTACH] [ATTACH=full]25283[/ATTACH] [/QUOTE]
Insert quotes…
Verification
What was Mr Irving's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Primary Chain PD1
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top